BEGIN{
# To cover entire field of view
# imax=31
# jmax=37
   if( prefix==NONE ){ prefix="test" }
   if( imax==NONE ){ imax=31 }
   if( jmax==NONE ){ jmax=37 }
   xzero = -int(imax/2)*5000
   yzero = -int(jmax/2)*4000
   for(i=0;i<imax;i++){
      for(j=0;j<jmax;j++){
         printf("%d ", i*5000+xzero)
         printf("%d ", j*4000+yzero)
         if(i<10){ printf("%s", prefix) }else{ printf("%s", prefix) }
         if(i<10){ printf("_0%d", i) }else{ printf("_%d", i) }
         if(j<10){ printf("_0%d", j) }else{ printf("_%d", j) }
         printf("\n")
      }
   }
}
{
}
END{
}